Inventories, Net and Significant Suppliers (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Inventories
Raw materials	$ 16,156	$ 17,014
Components	15,702	21,819
Work in process	2,326	1,071
Finished goods	40,238	54,447
Reserve for excess and obsolete inventory	(2,307)	(3,447)
Inventories, net	$ 72,115	$ 90,904